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Tourmaline

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Tourmaline

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Description
Locality: 
Vitosha Mountain, Sofia Province, Bulgaria
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.5 × 2.5 × 3.5 cm
Description

Black trigonal tourmaline crystals on albite matrix.

Mineral Data
What's on the rock

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7

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